Class D areas should normally extend upward from the surface up to and including 2,500 feet AGL. The altitude must be converted to MSL and rounded to the nearest 100 feet.
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In general, Class D airspace extends upwards from ground level to 2,500 above the airport elevation, with a radius of 4NM from the Class D airport. Each Class D area is individually tailored, and normally contain instrument procedures for IFR landings.
John Moore, NACO, recapped this issue. At some airports that have part-time control towers, the Class D surface airspace becomes a Class E Surface Area during the hours the tower is closed. At other airports, the Class D airspace becomes Class G (uncontrolled) airspace.
Without ADS-B Out, you can fly in any airspace except the ADS-B rule airspace defined by FAR 91.225 (see above). Note that ADS-B is not required in Class D airspace, or under a Class B or Class C airspace shelf, unless it lies within a Mode C veil.
Class D airspace: No transponder is required unless otherwise specified by ATC (Pilots only require two-way radio communication in this class of airspace).
Class D airspace includes the smallest airports in the United States with an operational control tower. Although it is required to request and receive permission from the FAA, it is typically easier to do than most airspaces due to the small number of manned aircraft in the area.
The main requirements for operating within Class D airspace are to have a functional two-way radio and to establish two-way communication with ATC prior to entering the airspace. Pilots must also meet all of the established weather minimums and obey speed regulations.